?????????????

????:??????????:??????????

??????????6???????????????????19?? (???????? ??????????)????,???????????

19????,???????????????????????????3.46??(??,????)??????????,???

?,????????????????????????????????????????????????(???)2.13?????????????,????????????????,??????;??????????????????????(???????????????)0.69???,??,?????????????????,???????????????????????????????????????????????,??;???????????????0.64????,??????????????,????????

????,????????4.43?,??????????

?????,????????????????????4.43??,????????????????????????????????????7??,??????????????????????,???????,??,??(????????) ?????:??????